Piston knurling machine



p 13, 1955 H. P. PHILLIPS 2,717,525

PISTON KNURLING MACHINE Original Filed Jan. 2'7, 1949 1 N V EN TOR. Hard/d 2 fi/m w Ex/m gm United States Patent PISTON KNURLING MACHINE Harold P. Phillips, Hastings, Mich., assignor to Hastings Manufacturing Company, Hastings, Mich., a corporation of Michigan Original application January 27, 1949, Serial No. 73,085, now Patent No. 2,651,958, dated September 15, 1953. Divided and this application May 17, 1952, Serial No. 288,370

6 Claims. (Cl. 80- 51) This invention relates to improvements in piston knurling machines. The present application is a division of my application for Letters Patent, Serial No. 73,085, filed January 27, 1949, now Patent No. 2,651,958, granted September 15, 1953. a

The main objects of this invention are:

First, to provide a manually operable machine for knurling the side walls of pistons for expanding or enlarging the same which is very simple in structure and operation and at the same time may be effectively used.

Second, to provide a machine of this character which is adapted for use in knurling pistons in a very wide range of sizes.

Third, to provide in a machine of this character an improved work holder.

Objects relating to details and economies of the invention will appear from the description to follow. The invention is defined and pointed out in the claims.

A preferred embodiment of the invention is illustrated in the accompanying drawing, in which:

Fig. 1 is a plan view of a knurling machine embodying my invention, the pressure arm being partially broken away. I

Fig. 2 is an enlarged fragmentary side elevational view with parts shown in vertical section and broken away, the actuating lever being shown in one 'endof its stroke by full lines and at the other end of its stroke by dotted lines.

Fig. 3 is an enlarged fragmentary view partially in section on broken lines 3-3 of Fig. 2.

Fig. 4 is an enlarged fragmentary view' illustrating the knurling tool in its relation to the Work.

The machine illustrated comprises a base 1, preferably a casting to provide substantial weight and stability. The base is provided with feet 2 at the corners thereof. The base has a carriage slideway 3 extending transversely thereof and adjacent its front end. An upwardly opening T-shaped slot 4 is disposed longitudinally and centrally of the slideway. The work carriage 5 is slidable on the slideway and is provided with a longitudinally extending r ib 6 on its underside guidingly engaging the slot 4. The head 7 of the clamping bolt 8-engages the T slot and is passed through the hole 9 in the carriage to receive the clamping nut 10, which for convenience and effective manipulation is provided with a handle 11.

The carriage is provided with a work holder upright 12 having a fiat face 13 and a vertical slot 14 opening to this face. The pin or bar like work holder 15 is disposed above and in vertical alignment with the slot 14, this holder being disposed through a hole 16 in the upright and adjustably secured therein by the set screw 17.

A piston 18 is illustrated in the drawing in mounted position on the carriage, the piston being slipped over the work holder 15 and clamped to the carriage upright by means of the eye bolt 19 which is disposed through the slot 14 and provided with a clamping nut 20 having an end wheel 21 for convenience in manipulation.

A pin 22 is passed through the eye of the clamping "ice b01t19 and through the wrist pin bearing openings 23 of the piston 6. The work is thus very securely supported upon the carriage and pistons of varying sizes may be effectively and quickly mounted and demounted.

The actuating lever 24 is pivotally mounted at 25 on the lever supporting bracket 26 on the base. The pivot 25 is parallel to the path of travel of the carriage so that the lever swings in a plane transversely of the path of travel of the carriage. The tool carrying pressure arm 27 is pivoted at 28 on the lever 24 and below the lever handle 29. The pivot 28 is parallel and substantially spaced from the pivot 25 of the lever so that as the lever 24 is actuated the tool carrying pressure arm is reciprocated longitudinally. The arm 27 is thus suported so it reciprocates above and is vertically swingable relative to the work. The arm 27 is provided with a handle 30 at its outer end. The arm 27 is provided with a downwardly projecting tool holder 31 slotted at 32 to receive the knurling wheel or tool 34 which is rotatably mounted on the journal or pivot 35. The bracket 26 is provided with a stop 36 while the lever has coacting threaded stops 37 disposed through ears 38 on the lever.

With the work mounted on the work holder, as shown in the drawing, the operator oscillates the lever with one hand while he applies pressure to the tool carrying arm 27 with the other. This oscillation and pressure on the tool is continued until the desired depth of knurl indicated at 39 in the drawing is secured.

When the desired knurl is secured the carriage is adjusted so that the tool is presented to the work at another position.

In Figs. 1 and 3 of the drawing the knurled strips 39 are shown spaced but they may be in effect continuous if that is deemed desirable. The knurling wheel is illustrated conventionally as is also the knurled surfaces.

The machine of my invention is highly efiicient, it is easy to operate and its proper manipulation is soon learned by workmen of average skill.

I have illustrated and described my invention'in a practical commercial embodiment thereof. I have not attempted to illustrate certain modifications which I contemplate as it is believed that this disclosure will enable those skilled in the art to embody or adapt my invention as may be desired.

Having 'thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a piston knurling machine the combination of a base provided with a transversely disposed slideway having an upwardly opening T slot extending longitudinally thereof, a work carriage slidably adjustable on said slidewayand having a downwardly projecting longitudinal rib guidingly engaging said slot, said carriage having a vertically slot-ted upright provided with a flat work supporting face, a clamping bolt on said carriage engaged with said slot for securing the carriage in its adjusted positions on said slideway, a pin like work holder mounted on said upright above the slot therein to project from the said work supporting face, a work clamping bolt disposed through said slot in said upright and having an eye at its inner end adapted to receive a pin disposed through the wrist pin holes of a piston mounted on said work holder, said clamping bolt being provided with a nut for clamping the piston mounted on the work holder against the said face of said upright, an actuating lever provided with a handle pivotally mounted on said base to swing in a plane transverse to the path of adjustment of said work carriage, a tool carrying and pressure arm having a handle pivotally mounted on said lever in overhanging vertical swinging relation to work on said work holder and with its pivot in spaced parallel relation to the pivot of said lever so that it is reciprocated endwise by the swinging movement of said lever, a tool holder on said pressure arm in overhanging relation to work on said work holder, a knurling tool on said tool holder engageable with a piston mounted on said work holder to be actuated with a reciprocating stroke by the reciprocation of said actuating lever, a stop on said base and coacting adjustable stops on said lever for limiting the stroke of the lever.

2. In a piston knurling machine, the combination of a base provided with a transversely disposed slideway, a work carriage slidably adjustable on said slideway and provided with a work holder, an actuating lever provided with a handle pivotally mounted on said base to swing in a plane transverse to the path of adjustment of said work carriage, a tool carrying and pressure arm having a handle pivotally mounted on said lever in overhanging vertical swinging relation to work on said work holder and with its pivot in spaced parallel relation to the pivot of said lever so that it is reciprocated endwise by the swinging movement of said lever, a tool holder on said pressure arm in overhanging relation to work on said work holder, a knurling tool on said tool holder engageable with a piston mounted on said work holder to be actuated with a reciprocating stroke by the reciprocation of said actuating lever, a stop on said base, and coacting adjustable stops on said lever for limiting the stroke of the lever.

3. In a piston knurling machine, the combination of a base provided with a transversely disposed slideway having an upwardly opening T slot extending longitudinally thereof, a work carriage slidably adjustable on said slideway and having a downwardly projecting longitudinal rib guidingly engaging said slot, said carriage having a work supporting upright, a clamping bolt on said carriage engaged with said slot for securing the carriage in its adjusted position on said slideway, a work holder mounted on said upright, an actuating lever provided with a handle pivotally mounted on said base to swing in a plane transverse to the path of adjustment of said work carriage, a tool carrying and pressure arm having a handle pivotally mounted on said lever in overhanging swinging relation to work on said work holder and with its pivot in spaced parallel relation to the pivot of said lever so that it is reciprocated endwise by the swinging movement of said lever, a knurling tool on said tool holder engageable with a piston mounted on said work holder to be actuated with a reciprocating stroke by the reciprocation of said actuating lever, and adjustable stop means for limiting the stroke of the lever.

4. In a piston knurling machine, the combination of a base provided with a transversely disposed slideway, a work carriage slidably adjustable on said slideway, said carriage having a work supporting upright, a work holder mounted on said upright, a manually actuated actuating lever pivotally mounted on said base to swing in a plane transverse to the path of adjustment of said work carriage and having a handle at its outer end, a tool carrying and pressure arm having a handle pivotally mounted on said lever below its said handle and in overhanging vertical swinging relation to work on said work holder and with its pivot in spaced parallel relation to the pivot of said lever so that it is reciprocated endwise by the swinging movement of said lever said tool carrying arm having a handle at its outer end so that pressure may be manually applied thereto simultaneously with the endwise reciprocation thereof by said actuating lever, a knurling tool on said tool holder engageable with a piston mounted on said work holder to be actuated with a reciprocating stroke by the reciprocation of said actuating lever, and adjustable stop means for limiting the stroke of the lever.

5. In a piston knurling machine, the combination of a base, a work carriage adjustably mounted on said base, said carriage having a vertically slotted upright provided with a flat work supporting face, a pin-like work holder mounted on said upirght above the slot therein to project from the said work supporting face, a work clamping bolt disposed through said slot in said upright and having an eye at its inner end adapted to receive a pin disposed through the wrist pin holes of a piston mounted on said work holder, said clamping bolt being provided with a nut for clamping the piston mounted on the work holder against the said face of said upright, an actuating lever provided with a handle pivotally mounted on said base to swing in a plane transverse to the path of adjustment of said work carriage, a tool carrying and pressure arm having a handle pivotally mounted on said lever in overhanging vertical swinging relation to work on said Work holder and with its pivot in spaced parallel relation to the pivot of said lever so that it is reciprocated endwise by the swinging movement of said lever, and a knurling tool on said tool holder engageable with a piston mounted on said Work holder to be actuated with a reciprocating stroke by the reciprocation of said actuating lever.

6. In a piston knurling machine, the combination of a base, a work carriage adjustably mounted on said base, a work holder, a manually actuated actuating lever pivotally mounted on said base to swing in a plane transverse to the path of adjustment of said work carriage and having a handle in its outer end, a tool carrying and pressure arm having a handle pivotally mounted on said actuating lever below said handle thereof and in overhanging vertical swinging relation to work on said work holder and with its pivot in spaced parallel relation to the pivot of said lever so that it is reciprocated endwise by the swinging movement of said lever said tool carrying and pressure arm having a handle on its free end so that pressure may be manually applied thereto simultaneously with its endwise reciprocation by said actuating lever, and a knurling tool on said tool holder engageable with a piston mounted on said work holder to be actuated with a reciprocating stroke by the reciprocation of said actuating lever.

References Cited-in the file of this patent UNITED STATES PATENTS 278,169 Nicholson May 22, 1883 478,540 Hancock July 5, 1892 504,769 Witherell Sept. 12, 1893 1,517,955 Clarkson Dec. 2, 1924 2,114,979 Horger et al Apr. 19, 1938 2,469,426 Anthony May 10, 1949 2,590,667 Wittman Mar. 25, 1952 2,653,495 Phillips Sept. 29, 1953 

